LA PAZ, Dec. 30 -- At least 10 people were killed and another five were seriously injured Monday in Bolivia when a minibus collided with a trailer, media reported.

The accident occurred at an exit along the highway linking the capital La Paz with El Alto, when the minibus rear-ended the trailer, the press said, citing Juan Luis Cuevas, chief of the Police Departments' Traffic Division.

The driver of the minibus, belonging to public transportation line 233, died in the crash.

Cuevas said 15 passengers were on board the minibus, and five were seriously injured in the incident.

Initial police reports suggest the crash may have been caused by speeding or mechanical failures, but an official report is not expected until the investigation is completed.